I Create a petrol engine in LBP. The motion is caused by explosions, not a motor joint, though there are 4 motor joints attached to the button on the left. when you press this button, 4 pistons extend with small motors on the end causing the 4 pistons to start moving. There are four magnetic key timers on the large wheels, which time the explosive drops in the cylinders at the top. These are made out of Ice, to keep friction down. Ice doesn't seem to break so it is perfect for the purpose.
Of course, once everything is up to speed, the engine runs itself.
So, this has: The starter motor, the CPU/Timer, and the physical engine.
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